Troubleshooting Image Faults; Making Initial Checks; Installation Environment; Checking The Originals - Canon NP6330 Service Manual

III. TROUBLESHOOTING IMAGE FAULTS
A. Making Initial Checks

1. Installation Environment

a. Be sure that the power supply provides the rated voltage (±10%; do not disconnect
the power plug during the night.)
b. Avoid areas which are subject to high/low temperature/humidity (near a water faucet,
water boiler, humidifier) or dust. Avoid areas near sources of fire.
c. Avoid areas subject to ammonium gas.
d. Avoid areas subject to direct rays of the sun; as necessary, provide curtains.
e. Make sure that the site is well ventilated.
f. Make sure that the copier is kept level.
g. Be sure that the copier remains powered throughout the night.
Check the site against the foregoing.

2. Checking the Originals

Find out whether the problem is due to the originals used or the copier.
a. The density correction setting in user mode is best when set to '5 ±1'.
b. Originals with a reddish background tend to have poor contrast; for example, red
sheets, slips.
c. Originals which are diazo copies or with transparency tend to produce copies which
can be mistaken for "foggy" copies.
Originals which are prepared in light pencil tend to produce copies which can be
mistaken for "light" copies.

3. Copyboard Cover, Copyboard Glass, and Standard White Plate

Check the copyboard cover, copyboard glass, and standard white plate for dirt; if dirt
is found, clean them with a solution of mild detergent or alcohol; if scratches are found,
on the other hand, replace them.

4. Charging Assemblies

a. Check each charging assembly for dirt and fault (scratches, for example).
b. Check to make sure that each charging assembly is properly set.

5. Developing Assembly

a. Check to make sure that the rolls of both ends of the developing assembly are in
contact with the drum.
b. Check to make sure that the surface of the developing cylinder is coated with an
even film of toner.

6. Paper

a. Check to make sure that the paper is of a type recommended by Canon.
b. Check to make sute that the paper is not moist. (Try using paper fresh out of
package.)
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
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